Kumamoto & Aso Road Trip from Fukuoka Airport | 1-Day and 2-Day Plans, and How to Check the Crater Restrictions

Kumamoto & Aso Road Trip from Fukuoka Airport | 1-Day and 2-Day Plans, and How to Check the Crater Restrictions

The short version: GoodCars has no bookable pick-up point in Kumamoto, so this route starts and ends at Fukuoka Airport. From the airport you take the Fukuoka Urban Expressway onto the Kyushu Expressway. Dazaifu IC to Kumamoto IC is about 91 km and 56 minutes; from Kumamoto IC, Route 57 takes you to Aso Station in about 50 minutes. When planning, allow 1.5 to 2 hours to central Kumamoto and 2.5 to 3 hours to Aso.

The real wild card on this route is not the road but the Nakadake crater. At the time of writing the Japan Meteorological Agency (JMA) had Mt. Aso at Volcanic Alert Level 2, and Aso City had closed the Aso-san Park Road, so crater viewing was suspended. That is why GoodCars built this plan so it still works when the crater is off limits.

For the bigger picture on renting in Kyushu and the KEP expressway pass, see our Kyushu car rental guide. Our 5-day Kyushu loop passes through Aso and Kumamoto on days 3 to 5. This article goes deeper on those two places only: parking, how to check the crater status, and mountain-road details. For Kurokawa Onsen, just north of Aso, see our Kurokawa Onsen road trip.

Aso's grasslands and volcano, about 2.5 to 3 hours' drive from Fukuoka Airport (illustrative image)

Fukuoka Airport to Kumamoto and Aso: driving time and tolls

The figures below come from the NEXCO West toll and route search for a standard car (checked at the time of writing, weekday midday departure). You join the urban expressway at one of the entrances around the airport (Kuko-dori, Hando-bashi, Kanenokuma and others); the route out of the airport is in our Fukuoka Airport car rental guide.

• On weekdays, ETC and cash cost the same. The roughly 30% weekend ETC discount applies only to the Kyushu Expressway part, and not during Golden Week, Obon, the New Year period or three-day weekends.
• The urban expressway is charged separately: the Fukuoka-Kitakyushu Expressway Public Corporation lists ¥630 cash, and ETC ¥630 on weekdays, ¥590 on Saturdays and ¥560 on Sundays and holidays, which is why the weekend total lands between ¥2,400 and ¥2,430.
• Round trip: about ¥6,520 on weekdays. If you are only doing Kumamoto and Aso, compare that with the KEP price first; the maths is in our Kyushu guide. An ETC card is worth it only if your rental provider offers one.
• The 56 minutes excludes stops. Add leaving the rental office, local roads near the airport and city traffic in Kumamoto, and GoodCars suggests 1.5 to 2 hours to central Kumamoto and 2.5 to 3 hours to Aso.

A few months before writing, Kumamoto had an earthquake. The northern restoration section of Route 57 towards Aso was closed at the time, and full overnight closures for works have been announced since. For Route 57 closures and works, check the notices from the MLIT Kumamoto River and National Highway Office, especially if you will come down the mountain in the evening or later; for expressways, check NEXCO West's iHighway, and for prefectural roads and snow or ice restrictions, Kumamoto Prefecture's Aso area road information.

Check Fukuoka Airport rentals

One day or two days: decide whether you are going up to Aso

The 2-day plan puts the mountain roads on the afternoon of day 1 and the morning of day 2, and ends with Kumamoto Castle, close to the interchange, so return day is simple. The 1-day Aso plan (B) is long and needs a pick-up as soon as the Fukuoka Airport pick-up point opens. In December the sun sets around 17:10 in Kumamoto, so GoodCars does not recommend the 1-day Aso plan in winter.

South from Kusasenri lies Minamiaso village, and further southeast is Takachiho in Miyazaki Prefecture. Both are on the way, but each needs at least half a day, so add a day if you want them; we do not cover them here. Driving times to Takachiho are in our Kyushu guide.

Kumamoto Castle: where to park and how to check what is open

Opening hours, admission and which gates are in use change with the season and the ongoing restoration work, so go by the visitor guide on the official Kumamoto Castle website, where you can also buy e-tickets in advance. At the time of writing the castle said it was operating normally, while some facilities at Sakuranobaba Josaien were temporarily closed and traffic restrictions towards Kato Shrine remained.

Parking: the castle directs cars to the Ninomaru, Sannomaru No. 1, Sannomaru No. 2, Miyauchi and Sakuranobaba car parks. Ninomaru has about 210 spaces, and vehicles over 5 m long cannot use it. The car parks close in the evening, so if you arrive late, check the parking and availability page first; fees are also listed there.

Kumamoto Castle's keep; check the official site for car parks and closing times (illustrative image)

Central Kumamoto is ordinary city driving, and the evening rush gets busy. GoodCars suggests visiting the castle around midday so you are not leaving in peak traffic.

Aso's outer rim: the Milk Road and Daikanbo

Aso is a double volcano: an outer rim about 900 m high surrounds the caldera floor. From Kumamoto IC follow Route 57 towards Aso, then climb onto the Milk Road along the northern rim, lined with ranches and pasture. The Kabutoiwa viewpoint beside it looks over the Aso valley and Komezuka.

The Milk Road takes you to Daikanbo. Aso City describes it as the best place to see the Five Peaks of Aso, which together look like a reclining Buddha, with views from the valley's rice fields across to both walls of the caldera. The name was given by the writer Tokutomi Soho.

Looking down from the outer rim into the farmland and towns of the Aso valley (illustrative image)

To continue to Kurokawa Onsen, the onsen's official map puts it about 72 km from Kumamoto city via Daikanbo; details are in our Kurokawa guide. If you are staying in Aso, drop down from Daikanbo into the valley and head for Aso Shrine.

From the valley to the mountain: Aso Shrine, Komezuka and Kusasenri

• Aso Shrine: head shrine of roughly 500 Aso shrines across Japan, with an unusual approach that runs sideways to the main hall. Its tower gate is counted among Japan's three great tower gates. Aso City lists two car parks, the shrine's own and the Ichinomiya central car park; park there and walk the shopping street in front of the shrine. Fees are as posted on site and on the city website.
• Komezuka: a grass-covered cone-shaped volcano 954 m high, designated a national Place of Scenic Beauty and Natural Monument. You see it from the road climbing from the valley towards Kusasenri.
• Kusasenri-ga-hama: an old crater that is now a round grassland about 1 km across, with a small hill and ponds where grazing horses come to drink. Aso City rules say do not approach, touch or feed the horses. The Kusasenri viewpoint next to it faces the smoking Nakadake.

Komezuka, a small volcano you pass on the way up (illustrative image)

Kusasenri's grassland and pond, with a viewpoint looking at Nakadake (illustrative image)

The car parks at Kusasenri and the Aso-san summit area charge a fee; check Aso City and the Natural Parks Foundation for current rates.

The crater is the big unknown: check these three sources on the day

At the time of writing, JMA had a near-crater warning (Volcanic Alert Level 2) for Mt. Aso, with caution required within about 1 km of the Nakadake first crater, and Aso City had closed the Aso-san Park Road, so crater viewing was suspended. Whether you can go can change day to day, so check on the morning you drive:

Nakadake crater: whether it is open depends on that day's restrictions (illustrative image)

• Even when it is open, not everyone may go: the crater gives off harmful volcanic gas, and Aso City turns away visitors with asthma, bronchial or heart conditions, or who feel unwell. Gas levels can also close it at short notice.
• Plan B: Kusasenri, Komezuka and Daikanbo are farther from the crater, but whether they are open and the roads passable still depends on the day's notices from Aso City and the JMA; if not, spend the time at Aso Shrine and Kumamoto Castle. A higher level means a wider restricted area, which is why you need to check every time.
• Never go past a barrier. If the road is closed, turn round rather than waiting by the roadside for it to open.

GoodCars advice: treat the crater as a bonus, not the centrepiece of the trip.

Mountain-road tips: fog, winter, fuel and grazing animals

Roads around Mt. Aso: when the weather turns, visibility drops fast (illustrative image)

• Fog: the outer rim and summit roads are high up, and fog can cut visibility within minutes. Turn on your fog lights, slow down, and do not stop on the shoulder; pull into a car park. Kumamoto Prefecture's Aso road information links to road cameras you can check beforehand. The Yamanami Highway towards Kurokawa and Yufuin is similar; see our Kyushu loop.
• Winter: from December to March the outer rim and summit can have snow and ice, even when Fukuoka is clear. Whether you need winter tyres and how to confirm them with the provider is covered in our Kyushu winter driving guide.
• Fuel: fill up in Kumamoto city or along Route 57 before heading up, and do not wait for the warning light on mountain roads.
• Animals: horses graze at Kusasenri and the outer rim is pasture land. Slow down when you see cattle or horses, and do not get out to approach or feed them.
• Be down before dark: the mountain roads have few street lights, so GoodCars suggests getting back to the valley or Kumamoto city before sunset.

Back to Fukuoka Airport: work backwards from your flight, and think twice about flying out of Kumamoto

Even without a flight to catch, you must be back within the hours when the Fukuoka Airport pick-up point (the supplier's office) handles returns: 08:00 to 21:00 at the time of writing, but the times you can select when booking through GoodCars are what count. Return, refuelling and shuttle details are in our Fukuoka Airport guide.

Think twice about flying out of Kumamoto: GoodCars has no bookable pick-up or return point in Kumamoto, and the booking page does not offer a Kumamoto return, so you cannot pick up in Fukuoka and drop off in Kumamoto. If your flight home leaves from Kumamoto Airport, you would still have to drive back to Fukuoka to return the car. For this route, booking your return flight from Fukuoka is the smoothest option.

Driving licence: most visitors need an International Driving Permit in the 1949 Geneva Convention format, together with their national licence and passport. Japan does not accept the Vienna Convention format, and an IDP cannot be issued once you are in Japan. Licences from Switzerland, Germany, France, Belgium, Monaco and Taiwan are used with an official Japanese translation instead of an IDP. You may drive for up to one year from entry, and not beyond your licence's expiry.

Insurance and damage-waiver cover depends on the provider's plan; when you book through GoodCars, the booking page shows what is included. The full system is explained in our complete guide to renting a car in Japan.

Frequently asked questions

Q1. How long does it take from Fukuoka Airport to Kumamoto and Aso?

Dazaifu IC to Kumamoto IC is about 56 minutes, and Kumamoto IC to Aso Station about 50 minutes. With local roads added, GoodCars suggests 1.5 to 2 hours to central Kumamoto and 2.5 to 3 hours to Aso.

Q2. How much are the tolls?

Kanenokuma entrance to Kumamoto IC is ¥3,260 one way on weekdays, and about ¥2,400–2,430 with ETC at weekends. Route 57 to Aso is an ordinary road with no toll.

Q3. Can I visit the Aso crater right now?

Not at the time of writing: the alert level was 2 and the Aso-san Park Road was closed. Check the crater restriction page and Aso City's notices on the day; if it is closed, go to Kusasenri, Komezuka and Daikanbo instead, checking the notices for those too before you set off.

Q4. Can I do Aso as a day trip from Fukuoka?

Yes, but it means about 5 hours of driving and an early pick-up. With early winter sunsets, GoodCars suggests two days instead, or only Kumamoto Castle on a day trip.

Q5. Where do I park for Kumamoto Castle?

The castle directs cars to the Ninomaru, Sannomaru No. 1 and No. 2, Miyauchi and Sakuranobaba car parks. Ninomaru has about 210 spaces but is not for vehicles over 5 m, which the castle directs to Sannomaru No. 1; if you arrive late, check closing times.

Q6. Can I drive up to Aso in winter?

From December to March the mountain may have snow and ice. Without winter tyres or snow-driving experience, stay off the outer rim and summit roads. Whether winter tyres are available depends on the provider, so confirm when booking; see our Kyushu winter guide.

Q7. Can I pick up in Fukuoka and return in Kumamoto?

No. GoodCars has no bookable pick-up or return point in Kumamoto, so every plan here starts and ends at Fukuoka Airport; book your flight home from Fukuoka.

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